Vibrating needle chain stitch mechanism



Nov., 11', 1936. F. L. JENNINGs 2,061,236

VIBRATING NEEDLE CHAIN STITCH MECHANISM Filed Feb, fr, 193e ATTORNEY Patented Nov. 17, 1936 UNITED s 'rii'rias PATENT OFFICE VIBRATING NEEDLE CHAIN STITCH MECHANISM The object of the invention is to provide improvements in button sewing machines, but more especially in the relatively automatic operation of the looper and thread finger.

Another object is to provide in such a device the combination of a rotatable looper, in combination with a diagonally reciprocatory thread finger.

A further object isto provide an improved thread finger, which is formed of. a single elongated member, provided at its relativelyfree end with a reversely, angularly directed, relatively slender, integral, pointed extension, which operates to remove a loop laterally from the abovementioned looper, and temporarily hold such loop toone side until another loop has been produced, and duly inserted thru said first loop.`

Still another object is to provide, in combination with the foregoing, means to guide the relatively free end portion of said finger in a diagonally extending path, while the opposite or actuated end portion of said finger element is restrained to a rectilinear path, which is angularly disposed with respect to said first path.

With these and other objects in mind, the invention comprises further details of construction and operation, which are hereinafter fully brought out in the following description, when read in conjunction with the accompanying drawing, in which Fig. 1 is a fragmentary top plan view of a portion of a button sewing machine, showing one embodiment of the invention; Fig. 2 is a vertical longitudinal section on the line 2 2 of Fig. 1; Fig. 3 is a vertical transverse section on the line 3--3 of Fig. 1; and Fig. 4 is plan View of a portion `of the mechanism shown in Fig. 1, but with the thread finger at the opposite end of its normal path of movement.

Referring to the drawing, only a portion of. a button sewing machine is represented, as being sufficient to illustrate the construction and operation of the present invention in one of its embodiments.

In this construction, a rotatable shaft l, is shown as being provided with a pinion 2 for connecting said shaft to any suitable form of driving or operating mechanism. Said shaft is also provided with a ca m 3, and upon its free end with a looper 4, of any well-known or suitable shape.

Substantially parallel with said shaft is an oscillatory bar 5, pivotally fixed at 6, and separated from, as well as being operated by, said cam through the medium of a suitable shoe 1. To the free end portion of said bar is pivotally connected at 8, an auxiliary extension 9, the angular relation of which extension to said bar being adjustably xed by means of a suitable set screw l0, while said extension is, itself, pivotally connected at Il to a block i2, which, in turn, is reciprocatably mounted within the usual guides I3.

To that end portion of said block adjacent to the looper 4, there is pivotally connected'at I4 a preferably angularly shaped link l5, which extends forwardly and diagonally to one side of 10 said looper, and is provided upon its free forward-most end portion with a slender, integral, reversely directed, nger portion I6.

The forward end portion of said link is also provided with a depending pin l1, which moves 15 to and fro in a fixed slot I8, thereby guiding the free end portion of. said link, and particularly the thread finger I6, in a diagonal path with respect to the plane of rotation of the looper 4.

In the operation of this device, the bar 5 is normally maintained in slidable bearing engage-- ment against the cam 3, which latter, upon being rotated, shifts the thread finger I6 from the position shown in Fig. 1, to the position shown in Fig. 4, and vice versa, as the looper 4 rotates in its customary manner, said bar 5 being at all times maintained in cooperation with the cam 3, through the medium of. the tension spring I9.

In the present invention, one of the principal features resides in the fact that the slot IB, which guides the thread finger alternately to and fro, is diagonally disposed with respect to the plane of movement of the looper. The advantage of this construction resides in the fact that a loop of thread, which has been previously formed by said looper, is easily and very quickly removed diagonally from the path of movement of said looper, and temporarily held in such position until the looper has had an opportunity to 40 form a second, or succeeding, thread loop, whereupon the thread finger instantly releases the first loop.

In previous constructions, wherein the thread loop is removed from the looper in line with the path of movement of said looper, or at least parallel therewith, the thread loop remains in contact with the thread finger for an appreciably longer period, and is thereafter released only as a result of the finger forcibly pushing the strands out of the way. By contrast, in the improved construction, the removal of the thread from the finger is materially assisted by the diagonal retraction of the finger itself, wherefore it is self evident that even such an improvement with Having thus described my invention, what I claim and desire to protect by Letters Patent of the United States is:- y

1. In a button sewing machine, the combination of a rotary thread looper, a link provided with an integral finger operative to draw a thread u loop from and momentarily to one side of the path of movement of said looper, means to reciprocate one end of said link in substantial alignment with the plane of movement of said looper, and means to guide the finger portion of said link in a path angularly disposed with respect to the plane of rotation of said looper.

2. In a button sewing machine, the combination of a rotary thread looper, a shaft carrying said looper, a cam also carried by said shaft, a link having a finger-like extension, means cooperating With said cam to reciprocate said link, and `guiding means to maintain the path of movement of said finger extension diagonally With respect to the plane of movement of said looper.

3. In a button sewing machine, the combination of a rotary thread looper, a. shaft carrying said looper, a cam also carried by said shaft, a link having a finger-like extension, a block movable in a fixed path and pivotally attached to one end portion of said link, means to guide another portion of said link diagonally with respect to the line of movement of said looper, and

a connecting bar pivotally mounted and engaging said cam and pivotally attached to said block,

4. In a button sewing machine, the combination of a rotary thread looper, a shaft carrying said looper, a cam also carried by said shaft, a link having a, finger-like extension, a block movable in a fixed path and pivotally attached to one end portion of said link, means to guide another portion of said link diagonally with respect to the plane of movement of said looper, a connecting bar pivotally mounted and engaging said cam and pivotally attached to said block, and means to adjust the relation of said block to said bar.

5. In a button sewing machine, the combination of a rotary thread looper, a shaft carrying said looper, a cam also carried by said shaft, a link having a nger-like extension, a block movable in a fixed path and pivotally attached to one end portion oflvsaid link, means to guide another portion vof said link diagonally with respect to the line of movement of said looper, a connecting bar pivotally mounted and engaging said cam and pivotally attached to said block, and vresilient means to yieldingly maintain said bar in cooperation with said cam. y

6. In a button sewing machine, the combination of a rotary thread looper a shaft carrying said looper, a cam also carried by said shaft, a link having a finger-like extension, a block movable in a rfixed path and pivotally attached to one end portion of said link, means to guide another portion of said link diagonally With vrespect to the line of movement of said looper, a connecting bar pivotally mounted and engaging said cam and pivotally attached to said block, means to adjust the relation of said block to said bar, and resilient means to yieldingly maintain said bar in cooperation With said cam.

FRANK L.VJENN1NGS. 

